Company correspondence: an important information resource

Haines, Michael

doi:10.1108/eb050692

Cited by 1 publication

(3 citation statements)

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“…To improve the match of these simple modes, we and 7. Perhaps this does indeed represent the "best" make use of equation (12) and the computed values set of Ds for this particular plate. But notice that of the Js, given for this plate in Table 3.…”

Section: The Required Aspect Ratio Is Given By A/b = (D/d)'j4 (28)mentioning

confidence: 96%

“…This fact suggests the use of plates rather than strips, which is the main subject of this paper. Equations (I)- (12) form the basis both for If our flat plate is cut from an orthotropic solid, measurements of the material properties of a flat then the four constants D, to Dd which we have used orthotropic plate, and for appli~tions of the can be related to the Young's moduii along the two measured values to predict the plate's behaviour.…”

Section: Formity Of H D D D3 and D)mentioning

confidence: 99%

“…mately equal to unity, and all the others are approxi-Certainly this plate is quite thick, and the ratio of mately zero. Thus to improve the fit of mode 1, for frequencies of modes 2 and 7 departs from that example, we change D4 (since J4 2 1 is the non-zero predicted by thin-plate theory in the right direction entry for that mode) according to equation (12) (with for the first effects of thick-plate corrections. Another w = 21cf ).…”

Section: The Required Aspect Ratio Is Given By A/b = (D/d)'j4 (28)mentioning

confidence: 99%

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On measuring the elastic and damping constants of orthotropic sheet materials

McIntyre

Woodhouse²

1988

Acta Metallurgica

123

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Many common sheet materials, ranging from natural materials such as wood to modern composites, possess approximately orthotropic symmetry. Within the approximations of thin-plate bending theory, the linear vibrational properties of such sheets are governed by four elastic constants and four damping constants (at any given frequency). A simple procedure is presented whereby all four elastic constants may be determined, quickly and with reasonable accuracy, from measurements of the resonant frequencies of low-frequency modes of thin rectangular plates with free edges. Also, at least three of the four damping constants may be determined by measuring the damping factors of the same modes-it turns out that the fourth damping constant does not usually have sufficient influence on the low-frequency modes for a reliable value to be found by this approach. The procedure is illustrated with measurements on a range of different sheet materials: wooden plates cut at different angles from the solid timber, plywood, and two very different fibre-reinforced composites. The discussion of these experimental results suggests that this simple procedure could form a valuable part of any programme of quality control, material selection or non-destructive testing involving orthotropic sheet materials.

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Section: The Required Aspect Ratio Is Given By A/b = (D/d)'j4 (28)mentioning

confidence: 96%

Section: Formity Of H D D D3 and D)mentioning

confidence: 99%

Section: The Required Aspect Ratio Is Given By A/b = (D/d)'j4 (28)mentioning

confidence: 99%

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